Preface

This report is part of a comprehensive study on 'Interactions between Livestock Production Systems and the Environment - Global Perspectives and Prospects'. The study is undertaken on the initiative of and financed of a group of donor countries. The Food and Agriculture Organization is the main contractor and components of the study have been subcontracted to different organizations and institutes in the donor countries.

The International Agriculture Centre (IAC) in Wageningen in the Netherlands has been subcontracted to implement the following 5 components of the study:

1. Management of waste from animal product processing.
2. Environmental impact of animal manure management.
3. Environmental impact assessment of landless monogastric production systems.
4. Environmental impact assessment of landless livestock ruminant systems.
5. Environmental impact assessment of mixed irrigated systems in the (sub-)humid zones.

- A.J. Nell	Project Coordinator, Senior Livestock Officer of the IAC.
- J. de Wit	Team Leader, Livestock Production Specialist of the IAC.

The following authors contributed to the individual studies:

- L.A.H.M. Verheyen, D. Wiersema and L.W. Hulshoff-Pol	Management of waste from animal product processing
- P. Brandjes	Animal manure management
- P.J. Westra	Landless ruminants production systems
- J.F.F.P. Bos	Landless monogastrics systems
- J.C.M. Jansen	Mixed irrigated systems in the humid zones

The IAC set up a Reference Committee for the implementation of this study with the following members:

- Prof. Dr. D. Zwart	Professor of Tropical Animal Production, Wageningen Agricultural University.
- Prof.Dr. H. van Keulen	Professor of Sustainable Animal Production, Wageningen Agricultural University.
- Prof. Dr. J.H. Koeman	Professor of Toxicology, Wageningen Agricultural University.
- Dr. H.A.J. Moll	Senior Economist, Department of Development Economics, Wageningen Agricultural University.
- H.G. van der Meer	Department Head, Grassland and Vegetation Science of the Research Institute for Agrobiology and Soil Fertility, Wageningen.

Besides this Reference Committee, much advice for this report was given by K.W. van der Hoek (National Institute of Public Health and Environmental Protection, Bilthoven).

We would like to thank everybody who in some form have contributed to this study.

The authors,

January 1996, Wageningen.